Method airplaneApproachTarget

src/OpenLoco/src/Vehicles/VehicleHead.cpp:2165–2227

0x004A94A9

    // 0x004A94A9
    bool VehicleHead::airplaneApproachTarget(const AirplaneApproachTargetParams& params)
    {
        auto yaw = spriteYaw;
        // Helicopter
        if (params.isHeliTakeOffEnd)
        {
            yaw = params.targetYaw;
        }
        Vehicle train(*this);
        Vehicle1* vehType1 = train.veh1;
        Vehicle2* vehType2 = train.veh2;

        auto [veh1Loc, veh2Loc] = calculateNextPosition(
            yaw, position, vehType1, vehType2->currentSpeed);

        Pos3 newLoc(veh2Loc.x, veh2Loc.y, params.targetZ);
        vehType1->var_4E = veh1Loc.x;
        vehType1->var_50 = veh1Loc.y;
        if (params.targetZ != position.z)
        {
            // Final section of landing / helicopter
            if (params.manhattanDistanceToStation <= 28)
            {
                int16_t zShift = 1;
                if (vehType2->currentSpeed >= 50.0_mph)
                {
                    zShift++;
                    if (vehType2->currentSpeed >= 100.0_mph)
                    {
                        zShift++;
                    }
                }

                if (params.targetZ < position.z)
                {
                    newLoc.z = std::max<int16_t>(params.targetZ, position.z - zShift);
                }
                else if (params.targetZ > position.z)
                {
                    newLoc.z = std::min<int16_t>(params.targetZ, position.z + zShift);
                }
            }
            else
            {
                int32_t zDiff = params.targetZ - position.z;
                // We want a SAR instruction so use >>5
                int32_t param1 = (zDiff * toSpeed16(vehType2->currentSpeed).getRaw()) >> 5;
                int32_t param2 = params.manhattanDistanceToStation - 18;

                auto modulo = param1 % param2;
                if (modulo < 0)
                {
                    newLoc.z = position.z + param1 / param2 - 1;
                }
                else
                {
                    newLoc.z = position.z + param1 / param2 + 1;
                }